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Belov D.F.

Saint Petersburg Multifield Hospital No. 2

Nikolaenko V.P.

City Multidisciplinary Hospital No. 2;
Saint Petersburg State University

Calculation of intraocular lens power after trabeculectomy

Authors:

Belov D.F., Nikolaenko V.P.

More about the authors

Journal: Russian Annals of Ophthalmology. 2021;137(6): 61‑66

DOI: 10.17116/oftalma202113706161

Read: 1971 times

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Table of contents

CALCULATION OF INTRAOCULAR LENS POWER AFTER TRABECULECTOMY
CALCULATION OF INTRAOCULAR LENS POWER AFTER TRABECULECTOMY

To cite this article:

Belov DF, Nikolaenko VP. Calculation of intraocular lens power after trabeculectomy. Russian Annals of Ophthalmology. 2021;137(6):61‑66. (In Russ.)
https://doi.org/10.17116/oftalma202113706161

Подписка 2026 Вестник офтальмологии (Russian Annals of Ophthalmology)
МСФ на ЯМ
Использование инфографики авторами научных работ
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Abstract:

PURPOSE

To assess biometric changes in eyes after trabeculectomy (TE) and its impact on refractive outcomes of phacoemulsification (PE) in order to determine the corrections for calculation of intraocular lens (IOL) power.

MATERIAL AND METHODS

The study included two groups of patients: the 1st group consisted of 116 patients who were assessed by optical biometry (IOL-Master 500) for mean biometric values before and after TE; the 2nd group included 31 patients with history of TE (study subgroup) and 47 individuals without glaucoma (control subgroup) who underwent PE with subsequent comparison of IOL calculation accuracy.

RESULTS

There was significant axial length (AL) shortening in the 1st group from 23.28±0.97 to 23.19±0.97 mm (p<0.001) 6 months after TE, which positively correlated (r=0.296, p=0.001) with intraocular pressure (IOP) decrease (from 25.4±5.34 to 17.2±4.42 mm Hg, p<0.001). Mean keratometry and anterior chamber depth values did not significantly change after TE. Mean IOL power calculation error after PE in the 2nd group was –0.05±0.47 D and 0.003±0.62 D for the control and study subgroups, respectively (p=0.697). However, significant impact of preoperative IOP on IOL power calculation error was discovered in the study subgroup (R2=0.526, p<0.001), but not in the control subgroup (R2=0.061, p=0.052). Based on linear regression, the expected IOL power calculation errors depending on the preoperative IOP were determined for patients with history of TE.

CONCLUSION

AL shortening due to decrease in IOP in patients with history of TE leads to IOL power calculation errors. Expected IOL calculation error related to preoperative IOP level was determined, which could help improve refractive outcomes of PE in patients with history of TE.

Keywords:

IOL power calculation
biometry
axial length
intraocular pressure
phacoemulsification
glaucoma
trabeculectomy

Authors:

Belov D.F.

Saint Petersburg Multifield Hospital No. 2

Nikolaenko V.P.

City Multidisciplinary Hospital No. 2;
Saint Petersburg State University

Received:

01.07.2020

Accepted:

01.09.2020

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